Earlier quoted context omitted.
It's a result of Japan environment (not only natural), they are too much and too concentrated as a result they can't live relaxed, they can only stress themselves. Few that born or arrive to a "comfort position" tend to exceed in any behavior, others whip themselves to the extreme. That's why we read about people who die working too much, who close themselves in their room for months or years, they use big load of an…
Not convincing. The inner boroughs of London are as dense as Tokyo and a dream to live in. Your hypotheses have not faced adequate tests of falsification yet.
As an aside, the censorship and flagging on HN is still ruthless and ridiculous. And the admins need to start reversing shadow bans (like mine) that they cannot defend.